If the meaning needed reflects concept to a significant degree specific to the culture of people speaking certain local language try using fu'ivla-looking words from this language. Examples: encere, ci'onmau.

If this still doesn't help try adding en- or el- prefix. Example: ente'atro

If you research in natlangs and see that the meaning doesn't exist in any known to you natlangs and isn't specific to Lojban